The phrase "a singular fact" is correct and usable in written English.
It can be used when emphasizing the uniqueness or distinctiveness of a particular fact in a discussion or argument.
Example: "In the debate about climate change, one singular fact remains: the planet is warming at an unprecedented rate."
Alternatives: "a unique fact" or "one distinct fact".
As the historian Bruce Catton once observed: "A singular fact about modern war is that it takes charge.
In 1821, Morton's letter was published in its journal, the Philosophical Transactions, under the modest title 'A Communication of a Singular Fact in Natural History'.
Thoreau talks about this same issue when he notes in his "Journals": "What a singular fact for an angel visitant to this earth to carry back in his note-book, that men were forbidden to expose their bodies under the severest penalties!" I began researching the taboo against nakedness, and discovered an extraordinarily rich vein of material that I have been mining ever since.
It is a singular fact, therefore, that from the birth of Bacon in 1561 to the death of the Scottish philosopher David Hume in 1776 i.e., for more than 200 years not one first-rate philosophical mind in Europe was permanently associated with a university.
He argues that Language, as a domain of signification, radically transcends the domain of a singular fact.
Another commentator noted that "it is a singular fact that neither of the men had a black eye; neither had an external cut worth mentioning".
What emerges is a stark and singular fact: crew members died and suffered terrible injuries because every one of the Horizon's defenses failed on April 20.
Across the country as the Guardian met with people for Dear Australia, a recurrent theme resonated powerfully in every interview: that of refusing to be defined by the singular fact of being a refugee.
But, as the Harvard economists David Bloom and David Canning suggest in their study of the "Celtic Tiger," of greater importance may have been a singular demographic fact.
Thus a reference to a singular contingent fact to explain why you never succeed in killing your younger self seems not to fulfil the requirement of being an explanation.
If one singular fact can be known under a physical mode of presentation as well as under a phenomenal mode of presentation, then the two items of knowledge involve two concepts (a phenomenal and a physical concept) with different primary intensions and these different primary intensions correspond to different properties.
